Digital Currency Futures Double-EMA Turning Point Strategy (Tutorial-3)

       // The condition of opening a long position is triggered and the current short position is held, or the condition of opening a long position is triggered and no position is held
        if (up && (state == SHORT || state == IDLE)) {
            // If you have a short position, close it first
            if (state == SHORT && cover(exchange.Buy, "closesell")) {
                // Mark open positions after closing them
                state = IDLE
                // The price of reset position is 0
                holdPrice = 0
                // Mark on the chart
                $.PlotFlag(r[l - 1].Time, 'coverShort', 'CS')
            }
            // Open a long position after closing the position
            exchange.SetDirection("buy")
            if (exchange.Buy(-1, amount)) {
                // Mark the current status
                state = LONG
                // Record the current price
                holdPrice = r[l - 1].Close
                $.PlotFlag(r[l - 1].Time, 'openLong', 'L')
            }
        } else if (down && (state == LONG || state == IDLE)) {
            // The same as the judgment of up condition
            if (state == LONG && cover(exchange.Sell, "closebuy")) {
                state = IDLE
                holdPrice = 0
                $.PlotFlag(r[l - 1].Time, 'coverLong', 'CL')
            }
            exchange.SetDirection("sell")
            if (exchange.Sell(-1, amount)) {
                state = SHORT
                holdPrice = r[l - 1].Close
                $.PlotFlag(r[l - 1].Time, 'openShort', 'S')
            }
        }
        
        // Stop profits
        if (state == LONG && r[l - 1].Close - holdPrice > profitTarget && cover(exchange.Sell, "closebuy")) {            
            state = IDLE
            holdPrice = 0
            $.PlotFlag(r[l - 1].Time, 'coverLong', 'CL')
        } else if (state == SHORT && holdPrice - r[l - 1].Close > profitTarget && cover(exchange.Buy, "closesell")) {            
            state = IDLE
            holdPrice = 0
            $.PlotFlag(r[l - 1].Time, 'coverShort', 'CS')
        }
        // Display time on the status bar
        LogStatus(_D())
        Sleep(500)        
    }
}

Strategy source code: https://www.fmz.com/strategy/333269

The strategy is for program design tutorial only, please do not use it in the real bot.

From: https://blog.mathquant.com/2022/10/28/digital-currency-futures-double-ema-turning-point-strategy-tutorial.html